Fix timestamps for bluetooth scanners that bundle advertisements (#94511)

#94138 added support for raw/bundled advertisements. We should use the
same monotonic time for all advertisements in the bundle if not time
is passed, or calculate the timestamp and pass it if its known

tests/components/bluetooth/test_diagnostics.py

@@ -5,7 +5,11 @@ from bleak.backends.scanner import AdvertisementData, BLEDevice
 from bluetooth_adapters import DEFAULT_ADDRESS
 
 from homeassistant.components import bluetooth
-from homeassistant.components.bluetooth import BaseHaRemoteScanner, HaBluetoothConnector
+from homeassistant.components.bluetooth import (
+    MONOTONIC_TIME,
+    BaseHaRemoteScanner,
+    HaBluetoothConnector,
+)
 from homeassistant.core import HomeAssistant
 
 from . import (
@@ -450,6 +454,7 @@ async def test_diagnostics_remote_adapter(
                 advertisement_data.manufacturer_data,
                 advertisement_data.tx_power,
                 {"scanner_specific_data": "test"},
+                MONOTONIC_TIME(),
             )
 
     with patch(